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Annual Biennial

Agrostemma githago 'Ocean Pearl'
  • RHS Plants for pollinators

corncockle 'Ocean Pearl'

A much-branched annual 60-90cm tall, with narrow, greyish-green leaves, and abundant, solitary white flowers, with fine dark speckling in the throat, in summer

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Size
Ultimate height
0.1–0.5 metres
Time to ultimate height
1 year
Ultimate spread
0.1–0.5 metres
Growing conditions
Loam
Sand
Moisture
Well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green Grey Silver
Summer White Green Grey Silver
Autumn
Winter
Position
  • Full sun
Aspect

West–facing or South–facing

Exposure
Exposed or Sheltered
Hardiness
H5
Botanical details
Family
Caryophyllaceae
Native to GB / Ireland
No
Foliage
Deciduous
Habit
Bushy
Potentially harmful
Human/Pets (dogs, poultry): Harmful if eaten. Wear gloves and other protective equipment when handling For further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
Genus

Agrostemma are upright annuals with narrow, opposite leaves and solitary, 5-petalled, open trumpet-shaped flowers with long calyx lobes showing between the petals

Name status

Accepted

How to grow

Cultivation

Grow in poor, well-drained soil in full sun. Lax growth needs to be staked, deadhead to prolong flowering. Flowers are suitable for cutting and are attractive to bees

Propagation

Propagate by seed sown in-situ, self-seeds prolifically

Suggested planting locations and garden types
  • City and courtyard gardens
  • Cottage and informal garden
  • Wildlife gardens
  • Flower borders and beds
Pruning

Cut back after flowering

Pests

Generally pest-free

Diseases

Generally disease-free

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